LED LUMINAIRE DESIGN: OPTIMIZATION AND ANALYSIS

LED Professional Magazine Webinar May 7, 2014

Presenter

●Dave Jacobsen Senior Application Engineer at Lambda

Research Corporation for over 5 years. Prior to that 20+ years at PerkinElmer, formerly EG&G, as a Principal Optical Engineer working with xenon light sources and systems.

● Lambda Research Corporation Celebrating our 21st year. Makers of

TracePro, TracePro Bridge for SolidWorks, and OSLO optical design and analysis software.

Agenda

● Designing LED lighting systems using SolidWorks and the TracePro Bridge for SolidWorks

● Making a LED property source property using the information from an LED datasheet

● Setting up and defining a 3D optical model for analysis and optimization

● Optimization methods

● Reflector optimization

● Diffuser optimization

● Creating IES files from the raytrace results

● Photorealistic rendering

The Goal – Design and Optimize a LED reflector and diffuser combination

LED Luminaire Design Process – Typical Workflow

Project Specification or Design Goal

Calculate Source Requirements

Choose Source

Model Source or get Ray File

Set up Initial Model of Optic (Lens or Reflector) in Interactive Optimizer

Set up Initial Model in TracePro, including Optic,

Source, and Target

Define Optimization Goals and Targets

Optimize Optic in Interactive Optimizer

LED Luminaire Design Process – Typical Workflow

Analyze Results in TracePro

Output Design, CAD Files, Drawings, IES Files

Fabricate Prototype

Measure Prototype and Verify Design Meets Design Goals

Update Model and Make Changes if Necessary

Deliver to Customer

Using SolidWorks to make the LED model – Seoul Semiconductor Acrich2-13W

Assigning optical properties to the LED model using the TracePro Bridge for SolidWorks

Exporting the model for analysis using the TracePro Bridge for SolidWorks

TracePro Bridge for SolidWorks

Live Demo

LED model with color properties applied

LED Datasheet – Seoul Semiconductor Acrich2-13W

Making a LED source property using the graphs on the LED datasheet

Making a LED source property using the graphs on the LED datasheet

Live Demo

Setting up the system for analysis and optimization

Setting up the system for analysis and optimization

LED array

Analyzing the initial raytrace results

Optimization methods– Downhill Simplex vs. Variable Scanning

The Downhill Simplex method is a local optimization method, meaning it will converge to the solution closest to the starting point. It’s possible

that a better solution is available. Changing the initial starting conditions can be used as a test to see if a better solution is available. This is a

good choice when optimizing geometry, position, and rotation where it is desirable to “jump” around the solution space to find and then refine

the best choices for variable values.

The Variable Scanning method is used to scan or step through all possible variable combinations. This can be used to define an

appropriate range of variables before starting a Downhill Simplex optimization, or in the example used in today’s webinar, to step through diffuser properties in a catalog to find the best option.

Optimization methods– Downhill Simplex Method

Solution Space

Best Solution

Local minima

Optimization methods– Variable Scanning Method

The Variable Scanning method can be used to step through each of the properties in a catalog of properties, in this case Mold-Tech profiles, to find the

best match for the optimization goal.

LED Professional Symposium and Expo

Lambda Research Corporation will be presenting a symposium on

LED Luminaire Design Optimization - Theory, Methods, and Applications

at the LED Professional Symposium and Expo

Bregenz, Austria, Sept. 30th-Oct. 2nd

Optimizing the reflector – Downhill Simplex Method

Optimizing the reflector

Optimizing the reflector - Video

Analyzing the raytrace results after reflector optimization

Analyzing the raytrace results after reflector optimization

Before Reflector Optimization After Reflector Optimization

Testing the results by re-optimizing with a different starting condition

Testing the results by re-optimizing with a different starting condition

First Optimization Start Condition Second Optimization Start Condition

Optimizing the choice of diffusers to improve performance

Optimizing the choice of diffusers to improve performance – Variable Scan Method

Optimizing the choice of diffusers to improve performance – Scheme Macro Code

Optimizing the choice of diffusers to improve performance - Video

Analyzing the raytrace results after diffuser optimization

Analyzing the raytrace results after diffuser optimization

After Reflector Optimization After Diffuser Optimization

Analyzing the raytrace results after optimization

Before Optimization After Reflector & Diffuser Optimization

Choosing from a catalog of arbitrary diffusers

Choosing from a catalog of arbitrary diffusers

Optimizing other parameters

Numerous additional parameters are open to optimization, including: •Position

•Thickness

•Rotational angle

•Reflector surface properties including reflectivity and scattering

•Diffuser material property

Generating an IES file

Viewing a lighting report in the IES/LDT Analysis Utility in TracePro

Photorealistic rendering results: with and without diffuser

Without Diffuser With Diffuser

Summary and Questions

TracePro streamlines the illumination design process and accelerates product time to market with:

A familiar CAD interface as well as the TracePro Bridge for SolidWorks

Superior raytracing performance

Tools and utilities optimized for the lighting and luminaire designer

Powerful 2D and 3D optimization capabilities

Comprehensive visualization and analysis tools For more information or to sign up for our free 30-day trial please visit us at:

www.lambdares.com

Phone: 978-486-0766 E-mail: sales@lambdares.com For questions about the topics in this webinar please contact Dave Jacobsen at: djacobsen@lambdares.com